Let $f ( x ) = 2 x ^ { 4 } - 3 x ^ { 3 } - 10 x ^ { 2 } + 20$

question 4

Essay

Let $f ( x ) = 2 x ^ { 4 } - 3 x ^ { 3 } - 10 x ^ { 2 } + 20$ . Use the graphs of f, $f ^ { \prime }$ , and $f ^ { \prime \prime }$ to estimate, to two decimal places, each of the following:
(a) The critical numbers of f.(b) The intervals where f is increasing.(c) The x values where f has inflection points.(d) The intervals where f is concave downward.

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